Cut the onion, carrot, cabbage, and celery into bite-sized pieces.
Heat olive oil in a pot and sauté the onion and carrot.
Add cabbage and celery, and sauté for another 2 minutes.
Add 500ml water and canned crushed tomatoes.
Season with chicken stock, salt, and pepper.
Simmer over medium-low heat for 20 minutes until the vegetables are cooked through.